Publications associated with Plasma Theory

Generation of photoionized plasmas in the laboratory: Analogues to astrophysical sources

Proceedings of the International Astronomical Union Cambridge University Press (CUP) 15 (2020) 321-325

S White, R Irwin, R Warwick, G Sarri, G Gribakin, F Keenan, E Hill, S Rose, G Ferland, F Wang, G Zhao, B Han, D Riley

Implementation of a novel experimental approach using a bright source of narrowband X-ray emission has enabled the production of a photoionized argon plasma of relevance to astrophysical modelling codes such as Cloudy. We present results showing that the photoionization parameter ζ = 4ÏF/ne generated using the VULCAN laser was ≈ 50 erg cm s-1, higher than those obtained previously with more powerful facilities. Comparison of our argon emission-line spectra in the 4.15-4.25 Å range at varying initial gas pressures with predictions from the Cloudy code and a simple time-dependent code are also presented. Finally we briefly discuss how this proof-of-principle experiment may be scaled to larger facilities such as ORION to produce the closest laboratory analogue to a photoionized plasma.

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